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United States Post Office and ZIP Codes Timeline

500 BC

  • 500 BC: “Neither snow nor rain nor heat nor gloom of night stays these couriers from the swift completion of their appointed rounds.” Greek philosopher, Herodotus, pens this phrase that later is inscribed over the main entrance of the New York City Post Office.

1600s

  • 1639: A tavern in Boston, owned by Richard Fairbanks, becomes the first post office in the United States.

1700s

  • 1753: Philadelphia printer Benjamin Franklin is named joint postmaster general. Franklin is later known as the “Father of the United States Postal Service.”
  • 1774: The British Government fires Benjamin Franklin as joint postmaster general due to his sympathies with colonists who wanted to break from England.
  • 1775: The Continental Congress appoints Benjamin Franklin as postmaster general.
  • 1785: The Post Office Department buys stagecoaches to carry the mail.
  • 1789: Samuel Osgood is appointed as the first postmaster general under the United States Constitution, by George Washington.

1800s

  • 1813: Steamboats are employed to carry mail.
  • 1829: The postmaster general becomes a member of the president's cabinet under Andrew Jackson.
  • 1832: Trains carry the mail in Pennsylvania.
  • 1838: Congress passes a law making all United States railroads post routes.
  • 1847: The first American postage stamps go on sale: a five-cent stamp depicts Benjamin Franklin, and a ten-cent stamp depicts George Washington. The use of stamps is optional - recipients can be required to pay postage.
  • 1855: The postal service makes the use of prepaid postage stamps mandatory for mail delivery.
  • 1855: Congress buys camels for the army to deliver mail over deserts in the Southwest.
  • 1858: Mail collection boxes are introduced on the streets of large cities. Before this, people were required to go to the post office to send letters.
  • 1860: The Pony Express begins on April 3rd.
  • 1861: The Pony Express ends after about a year and a half of service when workers finish laying telegraph lines across the United States. Telegraph messages are faster and cheaper than Pony Express delivery.
  • 1863: The postal department begins delivering mail to individual homes in large cities free of charge.
  • 1864: The first United States Railroad Post Office is established on a train. Mail is sorted while in transit by train on cars specially designed as sorting centers.
  • 1869: The Transcontinental railroad is completed, speeding mail delivery between New York and California in a week or less.
  • 1888: Owney, the mail dog, makes a mail delivery trip by wagon. He later accompanies the mail on trains around the country and even on ships to other countries.
  • 1893: Pneumatic tubes for mail delivery are introduced in Philadelphia. Air pressure pushes the tubes from the main post office to smaller branches in the city.
  • 1896: Rural Free Delivery (RFD) is introduced in West Virginia.
  • 1911: One of the first airmail flights in made. A sack of mail is flown three miles and dropped from the plane to the waiting postmaster.

1900s

  • 1913: The United States Post Office Department begins Parcel Post, their package delivery service, and establishes the COD (Collect on Delivery) system.
  • 1918: The first permanent airmail routes are established.
  • 1918: Stamp collector W.T. Robey buys a sheet of 100 defective airmail stamps. The 24-cent stamps depicted an upside down airplane. These later become some of the most valuable stamps in the world.
  • 1921: The first airmail delivery employing nighttime flight is completed. Mail is delivered from San Francisco to New York in under 34 hours.
  • 1943: The United States Post Office Department divides cities into zones. This was a precursor to the Zoning Improvement Plan Codes, or ZIP Codes.
  • 1963: ZIP Codes are introduced. ZIP Codes are five-digit numbers that enable mail to be sorted faster. Use of the code was not mandatory on any mail at first.
  • 1967: The Post Office requires second- and third-class bulk mail to be pre sorted by ZIP Code.
  • 1970: President Richard Nixon signs the Postal Reorganization Act.
  • 1971: The new United States Postal Service is born as an independent agency, no longer a part of the president's cabinet.
  • 1975: The practice of sending first-class mail traveling more than 200 miles by plane is established.
  • 1977: Express Mail service begins.
  • 1983: ZIP Codes are updated to ZIP + 4 Codes.
  • 1992: Stamp machines automate the sale of stamps.
  • 2000: The United States Postal Service opens the Postal Store on the Internet.
  • 2003: Zip-Codes.com allows Internet users to find Digital ZIP code maps & information online.
  • August, 23   2025: You are reviewing the timeline and making history :).